[Click] runtime error?

[weirong sun]

hi! i have written my own element,and i put it into click script to run for
testing.when click is running ,i get the following code:
*** glibc detected *** click/userlevel/click: corrupted double-linked list:
0x0a1be350 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7d1a07f]
/lib/tls/i686/cmov/libc.so.6[0xb7d1bb8d]
/lib/tls/i686/cmov/libc.so.6(__libc_malloc+0x95)[0xb7d1d9c5]
/usr/lib/libstdc++.so.6(_Znwj+0x27)[0xb7efcf47]
/usr/lib/libstdc++.so.6(_Znaj+0x1d)[0xb7efd08d]
click/userlevel/click(_ZN6Packet10alloc_dataEjjj+0x2f)[0x827484f]
click/userlevel/click(_ZN6Packet4makeEjPKvjj+0xa8)[0x8274ac8]
click/userlevel/click(_ZN10FromDevice8selectedEi+0x69)[0x821add9]
click/userlevel/click(_ZN6Master16run_selects_pollEb+0xd3)[0x829ce43]
click/userlevel/click(_ZN12RouterThread6driverEv+0x1b3)[0x8290d53]
click/userlevel/click(main+0x65d)[0x826caad]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5)[0xb7cc0775]
click/userlevel/click[0x80d96f1]
======= Memory map: ========
08048000-0835a000 r-xp 00000000 08:08 163251
/home/sun/click/userlevel/click
0835a000-0835b000 r--p 00311000 08:08 163251
/home/sun/click/userlevel/click
0835b000-0835c000 rw-p 00312000 08:08 163251
/home/sun/click/userlevel/click
0835c000-0835f000 rw-p 0835c000 00:00 0
0a186000-0a1c8000 rw-p 0a186000 00:00 0          [heap]
b7b00000-b7b21000 rw-p b7b00000 00:00 0
b7b21000-b7c00000 ---p b7b21000 00:00 0
b7c8f000-b7c91000 rw-p b7c8f000 00:00 0
b7c91000-b7ca6000 r-xp 00000000 08:08 6203       /lib/tls/i686/cmov/
libpthread-2.9.so
b7ca6000-b7ca7000 r--p 00014000 08:08 6203       /lib/tls/i686/cmov/
libpthread-2.9.so
b7ca7000-b7ca8000 rw-p 00015000 08:08 6203       /lib/tls/i686/cmov/
libpthread-2.9.so
b7ca8000-b7caa000 rw-p b7ca8000 00:00 0
b7caa000-b7e06000 r-xp 00000000 08:08 6177       /lib/tls/i686/cmov/
libc-2.9.so
b7e06000-b7e07000 ---p 0015c000 08:08 6177       /lib/tls/i686/cmov/
libc-2.9.so
b7e07000-b7e09000 r--p 0015c000 08:08 6177       /lib/tls/i686/cmov/
libc-2.9.so
b7e09000-b7e0a000 rw-p 0015e000 08:08 6177       /lib/tls/i686/cmov/
libc-2.9.so
b7e0a000-b7e0d000 rw-p b7e0a000 00:00 0
b7e0d000-b7e1a000 r-xp 00000000 08:08 2599       /lib/libgcc_s.so.1
b7e1a000-b7e1b000 r--p 0000c000 08:08 2599       /lib/libgcc_s.so.1
b7e1b000-b7e1c000 rw-p 0000d000 08:08 2599       /lib/libgcc_s.so.1
b7e1c000-b7e40000 r-xp 00000000 08:08 6185       /lib/tls/i686/cmov/
libm-2.9.so
b7e40000-b7e41000 r--p 00023000 08:08 6185       /lib/tls/i686/cmov/
libm-2.9.so
b7e41000-b7e42000 rw-p 00024000 08:08 6185       /lib/tls/i686/cmov/
libm-2.9.so
b7e42000-b7f26000 r-xp 00000000 08:08 10246
/usr/lib/libstdc++.so.6.0.10
b7f26000-b7f2a000 r--p 000e3000 08:08 10246
/usr/lib/libstdc++.so.6.0.10
b7f2a000-b7f2b000 rw-p 000e7000 08:08 10246
/usr/lib/libstdc++.so.6.0.10
b7f2b000-b7f32000 rw-p b7f2b000 00:00 0
b7f32000-b7f39000 r-xp 00000000 08:08 6207       /lib/tls/i686/cmov/
librt-2.9.so
b7f39000-b7f3a000 r--p 00006000 08:08 6207       /lib/tls/i686/cmov/
librt-2.9.so
b7f3a000-b7f3b000 rw-p 00007000 08:08 6207       /lib/tls/i686/cmov/
librt-2.9.so
b7f3b000-b7f3d000 r-xp 00000000 08:08 6183       /lib/tls/i686/cmov/
libdl-2.9.so
b7f3d000-b7f3e000 r--p 00001000 08:08 6183       /lib/tls/i686/cmov/
libdl-2.9.so
b7f3e000-b7f3f000 rw-p 00002000 08:08 6183       /lib/tls/i686/cmov/
libdl-2.9.so
b7f4d000-b7f4f000 rw-p b7f4d000 00:00 0
b7f4f000-b7f50000 r-xp b7f4f000 00:00 0          [vdso]
b7f50000-b7f6c000 r-xp 00000000 08:08 2557       /lib/ld-2.9.so
b7f6c000-b7f6d000 r--p 0001b000 08:08 2557       /lib/ld-2.9.so
b7f6d000-b7f6e000 rw-p 0001c000 08:08 2557       /lib/ld-2.9.so
bfb59000-bfb6e000 rw-p bffeb000 00:00 0          [stack]

it happens in random,i don't know what cause it and where are errors in my
element code,how to resolve this probliem? thanks a lot!